72644831 has 4 divisors (see below), whose sum is σ = 83022672. Its totient is φ = 62266992.

The previous prime is 72644807. The next prime is 72644851. The reversal of 72644831 is 13844627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13844627 = 233 ⋅59419.

It is a cyclic number.

It is not a de Polignac number, because 72644831 - 2²⁶ = 5535967 is a prime.

It is a super-2 number, since 2×72644831² = 10554542942037122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72644791 and 72644800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72644851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5188910 + ... + 5188923.

It is an arithmetic number, because the mean of its divisors is an integer number (20755668).

Almost surely, 2^72644831 is an apocalyptic number.

72644831 is a deficient number, since it is larger than the sum of its proper divisors (10377841).

72644831 is a wasteful number, since it uses less digits than its factorization.

72644831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10377840.

The product of its digits is 32256, while the sum is 35.

The square root of 72644831 is about 8523.1937089333. The cubic root of 72644831 is about 417.2550221176.

The spelling of 72644831 in words is "seventy-two million, six hundred forty-four thousand, eight hundred thirty-one".